hg: build-infra/jdk8: * Add hook for closed-source configure file.

[magnus.ihse.bursie at oracle.com]

Changeset: a53aea539002
Author:    ihse
Date:      2012-06-13 10:53 +0200
URL:       http://hg.openjdk.java.net/build-infra/jdk8/rev/a53aea539002

* Add hook for closed-source configure file.
* Add timestamp check at configure runtime to make sure the generated file is up-to-date.

! common/autoconf/autogen.sh
! common/autoconf/configure
! common/autoconf/configure.ac
! common/autoconf/generated-configure.sh